Flagstone Joints

by Rich Harris
(Amherst, Ohio)

I have a flagstone patio that is five years old. It was installed by the landscaper who did the rest of our yard, supposedly with 35 years of experience. He never fit the stones together properly, so I have some joints that are nearly non-existent and others that are several inches. The original screenings material washed out. He then tried polymer sand which broke up in the larger joints. He then tried mortar, but installed it so thin that it has now disintegrated. What sort of material would be best for the joints? I can't afford to tear the whole thing out and start over.

Rich Harris

I'm not sure if the pictures got loded properly.

Comments for Flagstone Joints

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possible solution
by: David

Dear Rich,

You need to clean out all of your joints at least 2 inches down. Then you need to cut small flagstone pieces into the big jointed areas in order to get away from the big joints.

You can use Portland Cement Type I-II to fill in the joints. However, if you are sitting on sand, that will also eventually break out over time. If you are over sand, then a breeze material is best suited because it will move with the sand underneath.

We hope that gives you some ideas to your problem.

Great luck!!

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